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do i=is,ie
        do j=js,je
         radius2=(i-floor(lx/dx/2))**2+(j-floor(ly/dy/2))**2
        
        
        Hx(i,j,k)=Hx_max*exp(-radius2/rr**2)*sin(2.0*pi*moving_dist/lambda)
        Hy(i,j,k)=-Hx_max*exp(-radius2/rr**2)*cos(2.0*pi*moving_dist/lambda)
      
   
        hz(i,j,k+1)=0.0
      
        ez(i,j,k)=0.0
      
        enddo
        enddo

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